libstdc++-v3/testsuite/20_util/tuple/77395.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2016-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <tuple>
  21 #include <utility>
  22
  23 struct derived;
  24 struct base
  25 {
  26     operator derived & () &;
  27     operator derived const & () const &;
  28     operator derived && () &&;
  29 };
  30
  31 struct derived : base {};
  32
  33 base::operator derived & () & { return *static_cast<derived *>(this); }
  34 base::operator derived const & () const & { return *static_cast<derived const *>(this); }
  35 base::operator derived && () && { return std::move(*static_cast<derived *>(this)); }
  36
  37 std::tuple<derived &&> test(base && b)
  38 {
  39     return std::tuple<derived &&>(std::move(b));
  40 }
  41
  42 int main(int,char**)
  43 {
  44     auto d = std::get<0>(test(derived{}));
  45     return 0;
  46 }